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Old 09-05-2012, 04:42 PM   #11
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This is the second time today I read complaints about a Yukon/Suburban struggling while crawling up grades. Here's the other thread Airlift 1000 are junk.

Xtrmtj - I really think its the truck or how its being driven. I also think you should use a WDH for that trailer but for other reasons. I can't see how a WDH will help with the problem you described.
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Old 09-05-2012, 04:57 PM   #12
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I bet the gear ratio is in the low threes and would explain a lot !
Take a suburban with a 323 ratio and a 5.3l engine and the same suburban with a 350 or 373 ratio and the same 5.3 engine and it would be night and day difference!
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Old 09-05-2012, 07:00 PM   #13
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Methinks you're right.
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Old 09-05-2012, 07:08 PM   #14
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It is a 3.73 rear end gear ratio. 4657 gvwr also
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Old 09-05-2012, 10:20 PM   #15
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Quote:
Originally Posted by Xtrmtj View Post
It is a 3.73 rear end gear ratio. 4657 gvwr also
Well, there goes that theory. A 3.73 rear end shouldn't be the problem.

That can't be the GVWR, though. That number is too low for a Yukon XL 4X4, which should be closer to 7,000-7,500lbs. Are you sure about that? The Gross Vehicle Weight Rating (GVWR) is the maximum a vehicle can safely weigh when loaded, including the vehicle itself, occupants, cargo and optional equipment.

Is that the trailer GVWR?
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Old 09-05-2012, 10:22 PM   #16
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Hmmmmmmm
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Old 09-05-2012, 10:30 PM   #17
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I've not been feeling the love for my 2012 Suburban this week. I have the 3.42 diff. Think that's the highest (?) you can get in the 1500 these days. Aerodynamic drag may be a factor. This truck is definitely over 3 tons. My Sunset Trail is about 2200 lbs heavier, but tows a lot better than my Surveyor 189. The Sunset Trail has a curved fiberglass front cap, the Surveyor has a flat front. With either though, in the hilly terrain of the Carolinas, expecting to cruise above 60 mph is just too stressful unless you enjoy the sound of a screaming V8. And 8 mpg is just gravy for the goose.
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Old 09-06-2012, 12:14 AM   #18
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well, i pull my Roo 23SS with an '07 Avalanche, basically the same as the Yukon, except with a pickup bed.
i have the 5.3 with the 3.73 that comes with the factory tow package. but the early GM900 models had the 4 speed tranny, whereas the latest ones have the 6 speed tranny but higher rear end ratios.

but i live in California and pull through mountains all the time, including the Sierras, Cascades and Siskiyous.
my 23SS weighs around 5000lbs. loaded for camping and i have no problems towing in the mountains.
i really don't pay much attention to the rpms, since the 4 speed will require it to rev higher on steep grades.
i have plenty of power and the only issues is the tranny runs a little hot, even with the factory tranny cooler.
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Old 09-06-2012, 09:32 PM   #19
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The weight I did post was for the trailer...sorry.

I think I really had unrealistic expectations on the towing at 65mph. I just need to relax and drive, get ore towing experience and one on.

I don't feel as though my step warrants a wdh, my Yukon doesn't squat and I have no issue with steering. Plus it won't help pulling the weight will it?

I am already using a friction sway bar to.

Keep the info coming please.
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Old 09-06-2012, 09:43 PM   #20
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I tow the mountains in western Canada. I try to keep my RPM's in the mid to low 3000. By the time I get to the top of the hill my speed drops to 40 mph. I could keep a higher speed but why make the truck work harder then it has to.
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